dataset

问题 I'm making a multiplayer text game, and every player in the game is assigned an inventory. The inventory is a simple linear linked list which contains the ID of the item and the state of the item in the game. For example, player1 could have a red car with 50% of fuel and it would be represented in the list as (5, 50) where 5 is the ID of a red car in the game and 50 is the amount of fuel of that specific car. But this means the information of every item in the game should be saved in some

问题 This question was migrated from Data Science Stack Exchange because it can be answered on Stack Overflow. Migrated 4 years ago . I need to merge (left join) two data sets x and y . merge(x,y, by.x = "z", by.y = "zP", all.x = TRUE) Every value of z is not there in zP but there must be nearest value in zP . So we need to use nearest value in zP for process of merging. For example z <- c(0.231, 0.045, 0.632, 0.217, 0.092, ...) zP <- c(0.010,0.013, 0.017, 0.021, ...) How can we do it in R ? 回答1:

问题 Referencing and assigning a subset of a matlab dataset appears to be extremely inefficient and possibly scales like rows^2 Example: alldata is a large dataset of mixed data - say 150,000 rows by 25 columns (integer, boolean and string). The format for the dataset is: 'format', '%s%u%u%u%u%u%s%s%s%s%s%s%s%u%u%u%u%s%u%s%s%u%s%s%s%s%u%s%u%s%s%s%u%s' I then convert 2 type integer cols into type boolean the following subset assignment: somedata = alldata(1:m,:) takes >7 sec for m = 10,000 and

问题 Mysql gives us a dataset When we run a select query in mysql and we use while or for loop statement to get each record from this dataset. I want to know is there any function to get the next record inside this dataset when we get a record without reach the top of the loop? something like: $result = mysql_query("SELECT * FROM table1"); while ($row = mysql_fetch_array($result)) { $currentId = $row['id']; $nextId = mysql_fetch_next()['id']; ...... } ?? 回答1: I would add another iteration that

问题 I've added a DataGridView control to my TabControl to display data that is stored in a single table of a local application database called Cellar.sdf . When I add the data source to the DataGridView, I select the table I want to display data from and preview the data. It displays the content inside the database. When I build the project I get the following errors: The type name 'CellarDataSetTableAdapters' does not exist in the type 'Winecellar.Winecellar' The type name 'CellarDataSet' does

问题 I'm trying to build a list (HTML) with a recursive relationship. The data is in a dataset but could converted to a data table if it's easier. I don't know what's the best option to achieve this. I was thinking about using nested repeaters. Here's the data: __ID__ | __NAME__ | __PARENT__ | __LEVEL__ 1 | Patrick | | 1 2 | Mark | | 1 3 | Scott | 2 | 2 4 | Jason | | 1 5 | Julian | | 1 6 | John | 6 | 2 7 | Steve | | 1 8 | George | 1 | 2 9 | Robert | 1 | 2 10 | Rodney | 8 | 3 Here the output I want

问题 I want to create nested XML from DataTable without loop. DataTable: Employee I had tried the following code snippet DataSet ds=new DataSet ("EmployeeDetails"); DataTable dtConvert = datatable to be converted ds.Tables.Add(dtConvert); ds.WriteXml("sample.txt"); and got the XML which looks like, <EmployeeDetails> <Employee> <name>John</name> <city>chennai</city> <state>Tamilnadu</state> <country>India</country> </Employee> <Employee> <name>David</name> <city>Bangalore</city> <state>Karnataka<

问题 I have a dataset with a column "person_code". This column contains the following data: "Carra" "Carra " -> one trailing space Now if i set the primary key of the dataset to the column "person_code" I'll get the following error: "These columns don't currently have unique values." Any way around this? The best I can think of is to add a new column "primary_key" and then replace the ending/starting spaces with another sign. This will cause some extra problems: if I replace them with _ and there

问题 I have fetched 3-4 tables by executing my stored procedure. Now they resides on my dataset. I have to maintain this dataset for multiple forms and I am not doing any DML operation on this dataset. Now this dataset contains 4 tables out of which i have to fetch some records to display data. Data stored in tables are in form of one to many relationship. i.e. In case of transactions. N records per record. Then these N records are further mapped to M records of 3rd table. Table 1 MAP_ID GUEST_ID

问题 I have a Column AMOUNT_PAISE in Dataset. I'm binding this dataset from the result set coming from sql server stored procedure. for AMOUNT_PAISE column in DB currency is in paise(lets say 888 paise for a particular row) but I want to display this amount in Rupees(Rupee equivalenof 888 paise is 8.88). But I can not directly assign it, because dataset contains int64 values. when I convert decimal 888 to int64 it gives 9 (888/100 = 8.88 and when converted to int64 it gives 9) So Please tell me